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  • Question

  • When the current through a coil reverses direction, the magnetic field around the coil _____. does n
    When the current through a coil reverses direction, the magnetic field around the coil _____.


  • Options
  • A. does not change
  • B. disappears
  • C. increases in strength
  • D. reverses direction

  • Correct Answer
  • reverses direction 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. ___ is the ability of a material to remain magnetized after removal of the magnetizing force.

    • Options
    • A. Reluctance
    • B. Hysteresis
    • C. Retentivity
    • D. Induction
      • Discuss
    • 2. When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage will _____.

    • Options
    • A. not be affected
    • B. equal 0 V
    • C. decrease
    • D. increase


      • Discuss
    • 3. The ___ is an electromagnetic device that contains a coil rotating on a jeweled bearing mount.

    • Options
    • A. permanent-magnet speaker
    • B. d'Arsonval movement
    • C. single-pole, double-throw relay
    • D. crankshaft position sensor
      • Discuss
    • 4. A group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___.

    • Options
    • A. retentivity
    • B. reluctance
    • C. hysteresis
    • D. flux
      • Discuss
    • 5. 
      The movable part in a relay is the _____.

    • Options
    • A. plunger
    • B. armature
    • C. cone
    • D. brushes
      • Discuss
    • 6. You can determine the direction of the lines of force surrounding a conductor by using _____.

    • Options
    • A. the right-hand rule
    • B. the left-hand rule
    • C. Lenz's law
    • D. Faraday's law
      • Discuss
    • 7. The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10?3 m2.

    • Options
    • A. 1800 µT
    • B. 555.56 T
    • C. 9 µT
    • D. 5 × 10?3 T
      • Discuss
    • 8. Ferromagnetic materials have minute magnetic ___ created within their atomic structure by the orbital motion and spin of electrons.

    • Options
    • A. forces
    • B. flux lines
    • C. domains
    • D. tapes
      • Discuss
    • 9. In a purely capacitive ac circuit, the amount of energy converted to heat is proportional to the circuit's current.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The current lags the source voltage in a series RC circuit.

    • Options
    • A. True
    • B. False
      • Discuss

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